Every retailer assigns its own internal SKU to the same physical refrigerator. Amazon calls a Samsung 4-Door Flex an ASIN like B0CM5R97SV. Best Buy gives it a SKU like 6520283. Home Depot uses a different number entirely. Without a canonical anchor, you can't reliably aggregate review counts, price history, or recall notices for the same physical product across stores.

The FIN is that anchor. It lets Fridge.com link the same physical model across every retailer that sells it, so when you look at a refrigerator's page, you see the full picture: years of price history, the lowest current price across all retailers, real customer reviews from every store that sells it, any active CPSC recall notices, and the manufacturer's spec sheets and owners manuals — all under one identifier.